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68c968f6f3
* fix(frontend): keep orphan tool messages visible LangGraph `messages-tuple` stream mode can emit tool-result events out of order or replay them from subagent state (e.g. the bash subagent under LocalSandboxProvider with allow_host_bash: true). When that happens, the tool message arrives after a terminal assistant/human group, so getMessageGroups' lastOpenGroup() returns null. The previous behaviour was console.error + drop, which silently hid the tool result from the UI - the user could not see the tool output or tool-call records even though the agent executed the action correctly (backend + Langfuse trace were both fine). Fallback now attaches the orphan tool message to the most recent group so the UI shows it. Adds a unit test that covers the orphan-tool path and a duplicate-stream regression test. * test(frontend): make orphan-tool replay test actually reach the fallback The previous fixture was `human → ai(tool_calls) → tool → tool(replay)` with no terminal group in between, so both tool messages hit the unchanged happy path (`open.messages.push(...)`). Neither message was an orphan, the new `else if (groups.length > 0)` fallback was never exercised, and the `>= 1` length assertion was satisfied trivially by t-1a alone. Interleave a terminal assistant message between the original tool result and the replayed one, so t-1b arrives when lastOpenGroup() returns null. Now the strict assertion that t-1b is reachable can only pass via the new fallback branch. Review feedback from @willem-bd on PR #3880. * fix(frontend): satisfy noUncheckedIndexedAccess in orphan-tool fallback The fallback branch pushed into `groups[groups.length - 1].messages` directly, which trips `noUncheckedIndexedAccess` under the project's strict TS config and breaks lint-frontend, e2e-tests, and the full-stack render CI layer. Take `groups[groups.length - 1]` into a local `lastGroup` and check for `undefined` explicitly. The `else if (groups.length > 0)` guard becomes redundant once `lastGroup` is checked, so the branches are folded into the outer `else` to keep the structure flat. Behavior is unchanged: orphan tools still attach to the most recent group, and the empty-groups diagnostic still logs at ERROR level. Review feedback from @willem-bd on PR #3880. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
DeerFlow Frontend
Like the original DeerFlow 1.0, we would love to give the community a minimalistic and easy-to-use web interface with a more modern and flexible architecture.
Tech Stack
- Framework: Next.js 16 with App Router
- UI: React 19, Tailwind CSS 4, Shadcn UI, MagicUI and React Bits
- AI Integration: LangGraph SDK and Vercel AI Elements
Quick Start
Prerequisites
- Node.js 22+
- pnpm 10.26.2+
Installation
# Install dependencies
pnpm install
# Copy environment variables
cp .env.example .env
# Edit .env with your configuration
Development
# Start development server
pnpm dev
# The app will be available at http://localhost:3000
Build & Test
# Type check
pnpm typecheck
# Check formatting
pnpm format
# Apply formatting
pnpm format:write
# Lint
pnpm lint
# Run unit tests
pnpm test
# One-time setup: install Playwright Chromium browser
pnpm exec playwright install chromium
# Run E2E tests (builds and starts production server automatically)
pnpm test:e2e
# Build for production
pnpm build
# Start production server
pnpm start
Site Map
├── / # Landing page
├── /chats # Chat list
├── /chats/new # New chat page
└── /chats/[thread_id] # A specific chat page
Configuration
Environment Variables
Key environment variables (see .env.example for full list):
# Backend API URL (optional, uses local Next.js/nginx proxy by default)
NEXT_PUBLIC_BACKEND_BASE_URL="http://localhost:8001"
# LangGraph-compatible API URL (optional, uses local Next.js/nginx proxy by default)
NEXT_PUBLIC_LANGGRAPH_BASE_URL="http://localhost:8001/api"
Project Structure
tests/
├── e2e/ # E2E tests (Playwright, Chromium, mocked backend)
└── unit/ # Unit tests (mirrors src/ layout)
src/
├── app/ # Next.js App Router pages
│ ├── api/ # API routes
│ ├── workspace/ # Main workspace pages
│ └── mock/ # Mock/demo pages
├── components/ # React components
│ ├── ui/ # Reusable UI components
│ ├── workspace/ # Workspace-specific components
│ ├── landing/ # Landing page components
│ └── ai-elements/ # AI-related UI elements
├── core/ # Core business logic
│ ├── api/ # API client & data fetching
│ ├── artifacts/ # Artifact management
│ ├── config/ # App configuration
│ ├── i18n/ # Internationalization
│ ├── mcp/ # MCP integration
│ ├── messages/ # Message handling
│ ├── models/ # Data models & types
│ ├── settings/ # User settings
│ ├── skills/ # Skills system
│ ├── threads/ # Thread management
│ ├── todos/ # Todo system
│ └── utils/ # Utility functions
├── hooks/ # Custom React hooks
├── lib/ # Shared libraries & utilities
├── server/ # Server-side code
│ └── better-auth/ # Authentication setup and session helpers
└── styles/ # Global styles
Scripts
| Command | Description |
|---|---|
pnpm dev |
Start development server with Turbopack |
pnpm build |
Build for production |
pnpm start |
Start production server |
pnpm test |
Run unit tests with Rstest |
pnpm test:e2e |
Run E2E tests with Playwright |
pnpm format |
Check formatting with Prettier |
pnpm format:write |
Apply formatting with Prettier |
pnpm lint |
Run ESLint |
pnpm lint:fix |
Fix ESLint issues |
pnpm typecheck |
Run TypeScript type checking |
pnpm check |
Run both lint and typecheck |
Development Notes
- Uses pnpm workspaces (see
packageManagerin package.json) - Turbopack enabled by default in development for faster builds
- Environment validation can be skipped with
SKIP_ENV_VALIDATION=1(useful for Docker) - Backend API URLs are optional; nginx proxy is used by default in development
License
MIT License. See LICENSE for details.